Cikgu pilih adik awak sbg menantu

Went to my younger brothers/sister's school yesterday instead of my parents to meet their teachers and received their report card. It is kinda awkward haha but people always mistaken my age which they thought I am 22+, so I think 'redah je ni utk masa hadapan kakaka'. But I don't know how to respond when a teacher said to me like this..

Teacher: Nama pelajar siapa ye?
Me: Oh, adik saya nama Khairil Anwar..
Teacher: Ahh.. awak ada adik lagi satu kan? Nama Luqman?
Me: Haa ye.. ada lagi.. 
Teacher: Itu menantu saya tu..... Saya dah pilih dia.
Me: huh? (just smile awkwardly)

Told my mom about this and she just smile. 
What an awkward situation I had because excuse me cikgu, adik saya tu yg ke-6 kot atas dia ada lagi 5 and even we the elders siblings don't think about that yet err.... 

but that's mean our Luqman gave the teacher best perception :)

Awas anak cikgu sekalian, bakal suami/isteri kamu kelak kemungkinan besar daripada kalangan anak murid ibu ayah awak! Selamat lah ye!